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Yes, seeing similar problem. Also finding this in Console: Library Validation failed: Rejecting '/private/tmp/com.apple.installer4tmhYtZ1/myInstallerPlugin.bundle/Contents/MacOS/myInstallerPlugin' (Team ID: ****, platform: no) for process 'InstallerRemoteP(3911)' (Team ID: none, platform: yes), reason: mapping process is a platform binary, but mapped file is not I notice that Catalina's Installer.app has this output from codesign -dv: CodeDirectory v=20100 size=551 flags=0x2000(library-validation) hashes=12+3 location=embedded But Big Sur has: CodeDirectory v=20100 size=2564 flags=0x0(none) hashes=75+3 location=embedded